Common Lisp is a general-purpose,
industrial-strength, ANSI standard (X3.226 1994) Lisp
dialect -- probably the most actively used. The full
text of the language specification is also available as the Common
Lisp HyperSpec, a mechanically generated HTML version of the
official standard.

Scheme is probably the second most widely used dialect of Lisp. Although, it is primarily used in
academiaand research, there are several commercial scheme-based
companies. The Scheme community holds annual workshops usually co-locatd with the
ICFP (International Conference on Functional Programming) conferences.
The language specification is the Revised^5
Report on the Algorithmic Language Scheme.

Source Code and Tools

Miscellaneous

Arc is a new dialect of Lisp for expert programmers, especially
suited for web applications. Arc is being designed and implemented
mainly by Paul Graham. The
following resources are currently available: